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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NET_QUIC_QUIC_ACK_NOTIFIER_H_
#define NET_QUIC_QUIC_ACK_NOTIFIER_H_
#include "net/quic/quic_protocol.h"
namespace net {
// Used to register with a QuicConnection for notification once a set of packets
// have all been ACKed.
// The connection informs this class of newly ACKed sequence numbers, and once
// we have seen ACKs for all the sequence numbers we are interested in, we
// trigger a call to a provided Closure.
class NET_EXPORT_PRIVATE QuicAckNotifier {
public:
class NET_EXPORT_PRIVATE DelegateInterface {
public:
DelegateInterface();
virtual ~DelegateInterface();
virtual void OnAckNotification() = 0;
};
explicit QuicAckNotifier(DelegateInterface* delegate);
virtual ~QuicAckNotifier();
// Register a sequence number that this AckNotifier should be interested in.
void AddSequenceNumber(const QuicPacketSequenceNumber& sequence_number);
// Register a set of sequence numbers that this AckNotifier should be
// interested in.
void AddSequenceNumbers(const SequenceNumberSet& sequence_numbers);
// Called by the QuicConnection on receipt of new ACK frame, with the sequence
// number referenced by the ACK frame.
// Deletes the matching sequence number from the stored set of sequence
// numbers. If this set is now empty, call the stored delegate's
// OnAckNotification method.
//
// Returns true if the provided sequence_number caused the delegate to be
// called, false otherwise.
bool OnAck(QuicPacketSequenceNumber sequence_number);
bool IsEmpty() { return sequence_numbers_.empty(); }
// If a packet is retransmitted by the connection it will be sent with a
// different sequence number. Updates our internal set of sequence_numbers to
// track the latest number.
void UpdateSequenceNumber(QuicPacketSequenceNumber old_sequence_number,
QuicPacketSequenceNumber new_sequence_number);
private:
// The delegate's OnAckNotification() method will be called once we have been
// notified of ACKs for all the sequence numbers we are tracking.
// This is not owned by OnAckNotifier and must outlive it.
DelegateInterface* delegate_;
// Set of sequence numbers this notifier is waiting to hear about. The
// delegate will not be called until this is an empty set.
SequenceNumberSet sequence_numbers_;
};
}; // namespace net
#endif // NET_QUIC_QUIC_ACK_NOTIFIER_H_
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